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2014-09-29T12:49:34+03:00
 \frac{50}{27+x} =  \frac{83-8}{90} 
 


 \frac{50}{27+x} =  \frac{75}{90} (simplificam) =  \frac{5}{6}

5  · (27+x) = 50 · 6
5x + 135 = 300
5x = 300 - 135
5x = 165
x = 165 : 5
x = 33